JPS58117647A - Base body for negative electrode plate for lead storage battery and its manufacture - Google Patents

Abstract

PURPOSE:To provide a light base body for a negative electrode for a lead storage battery, which has a high manufacturing efficiency, by laminating a grid base body made of a lead alloy having a decreased weight, and grid base bodies made of a synthetic resin. CONSTITUTION:A grid base body 1 which is made of lead or a lead alloy and continuously manufactured by an expanding or stamping method, is moved in the direction indicated by the arrow by means of a roll 2. Grid-like acid-proof oxidation-proof synthetic resin sheets 4 are supplied to the upper and the lower surfaces of the grid base 1 by means of supply rolls 3, according to the movements of pressure rolls 5 so as to form a three-layered body. After that, the above three-layered body is passed between heated heat rolls 6 so as to make the synthetic resins 4 placed on the surfaces of the grid base 1 to be fused to the base 1. As a result, an active-material holding body is made by covering the grid base 1, which is made of a thin lead alloy sheet, with the grid-like synthetic resins 4 in such a manner as mentioned above.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lead-acid battery cathode plate substrate and a method for manufacturing the same.

It is an object of the present invention to provide a substrate for a cathode plate that is as light as possible compared to a conventional lead alloy grid substrate 1c.

In recent years, the most important issue for automobile manufacturers has been to improve the fuel efficiency of automobiles, and along with this, it is naturally required that automobile marine storage batteries be made lighter as well. Moreover, the degree of weight reduction is quite strict at 1O-101G, and it is thought that the demands for weight reduction will become even stricter in the future.

In order to achieve this weight reduction, k is the active material, substrate, battery case,
A comprehensive study including lead parts is required. Among these, reducing the weight of the lattice base is a specialized and heavy duty, and the key to achieving a lightweight battery is how far the weight of the lattice base can be reduced. However, when it comes to reducing the weight of the grid base, there is a limit to the battery performance in reducing the weight of the anode grid base. According to FJ, the lattice substrate for the anode is filled with a material that fills the area of active material such as lead dioxide or semiconductor, so that the lattice substrate becomes a path for current.

This is because as the weight of the lattice base is reduced, the resistance of the lattice base increases, leading to a decrease in battery voltage, which greatly contributes to starting the engine of an automobile. On the contrary,
The grid substrate for the cathode.

Since the active material filled in it is lead or a conductor, Ic,
It is possible to reduce the weight compared to the grid substrate for anode. However, with the conventional method of casting using a lead alloy, it is impossible to mass-produce the current grid base by reducing its weight. Therefore, a method is used in which a lead alloy is formed into a sheet by rolling or continuous casting, and then expanded or punched to form a lattice substrate. It is possible to make the thickness of the sheet up to about α4■, and if such a sheet is used to make a lattice base by expanding or punching, it will be possible to manufacture a lattice base that is considerably lighter in weight. However, if the grid base is manufactured only from such a lead alloy, it will not weigh as much as the known synthetic resin grid base having acid and oxidation resistance.

On the other hand, for such a synthetic resin grid base, conductor parts made of lead or lead alloy are manufactured by casting, and each piece is placed in a predetermined position in a mold.

Since this method uses synthetic resin injection molding, it is clear that it is not suitable for mass production.

The present invention eliminates the above-mentioned drawbacks and provides a lightweight and highly productive lead-acid battery cathode substrate.

Next, one implementation #V of the present invention will be explained.

For example, for the cathode grid base of an N540Z or N50Z type marine storage battery, if it is about 30 to 20 cells/sheet, it is possible to use an expanded grid base or punched grid base made of ordinary lead alloy, or if the weight is less than that. To become and.

In order to manufacture a lattice substrate using the above manufacturing method, it is necessary to reduce the weight by using an extremely thin lead alloy sheet or by folding the lattice substrate.In such a lattice substrate, the active material Even if it is filled with lattice, it does not have the ability to retain the active material, and therefore, the active material falls off from the lattice substrate during the battery assembly process.

In view of the above points, the present invention provides a substrate for a cathode plate that can prevent active materials from falling off.

1 is a lattice base made of lead or lead alloy made continuously by an expanded band or punching method, whose weight has been reduced to the extent that it cannot hold the active material mentioned above, and is moved by roll 2 in the direction of the solid line arrow in Fig. 1. . While moving in the direction of the solid line arrow, the lattice substrate l is formed into a lattice shape as shown in FIG.
An oxidation-resistant synthetic resin sheet 4 is supplied to the upper and lower surfaces of the lattice substrate 1 as the pressure roll 5 moves to form a three-layer body, and the three-layer body is heated by a heat roll 6. To pass +
Therefore, the synthetic resin bodies 4 placed on the upper and lower surfaces of the lattice base 1 are thermally welded and integrated with the lattice base 1f sandwiched therebetween. The lattice base 1 made of such a thin lead alloy sheet or the lattice base 1 with enlarged folds is covered with a synthetic resin body 4 having a lattice shape to form an active material holder.

If it is necessary to further reduce the weight of the lattice base 1.

The synthetic resin body 4 having the grid shape shown in Figure 6 is moved in the direction of the arrow onto a set of belt conveyors through a tension y (-m).

Next, a lead alloy sheet is punched in advance or
A conductor portion 7 as shown in FIG. 3 or FIG. 4, manufactured by a casting method or the like from a similar molten lead alloy, is supplied to a predetermined position 1 of the synthetic resin body 4.

The predetermined position at which this conductor portion 7 is placed is determined by a claw 9 attached to a chain 8 that moves in synchronization with and in the same direction as the synthetic resin body 4, as shown in FIG.
The conductor portion 7 is fixed by this. In FIG. 5, a synthetic resin body 4 on which a conductor part 7 is placed is connected to a sheet-like synthetic resin body 4' of the same shape supplied from a roll 3 and a roll 51.
Then, the three layers are stacked to form a three-layered body, and the three-layered body is passed through a heated heat roll 6 to heat-weld the upper and lower V-@ shaped synthetic resin bodies 4°4' of the conductor portion 7. Unify.

In this way, an expanded lattice substrate made of Ni-lead alloy, a punched lattice substrate, or a continuous lattice substrate formed of a layer narrowed by a synthetic resin body 4IC in a lattice shape from above and below the conductor portion 7 is one ordinary one. Like the lead-acid battery lattice substrate, the active material paste is filled and then cut at cutting locations 10 shown in FIG. 2 to form the desired lattice substrate shape.

According to the present invention, even a lattice substrate made of a lead alloy whose weight has been reduced to such an extent that it loses its ability to retain active material.

Even grids made of synthetic resin, which have been considered inappropriate for mass production, will have to be manufactured continuously.

The temperature at which the synthetic resin body 4 formed into a lattice shape is thermally welded using the heated heat roll 6 shown in FIGS. 1 and 5 varies depending on the type and thickness of the synthetic resin.
If the thickness is about 1 inch, the temperature is 50 to 80°C for polystyrene, vinyl chloride, etc., and about 100 to 120°C for polyethylene, polypropylene, etc.

Next, one embodiment of the IL present invention will be described.

A lead-calcium alloy with a thickness of α86cm is used.

A pole grid substrate A of an N54OZ type ship storage battery was manufactured by the method according to the present invention. The expanded grating substrate used at this time was 115 x H 120° and weighed 16 f/sheet.
This lattice substrate alone indicates that the active material was likely to fall off during the battery assembly process, but the method according to the present invention allowed the battery to be assembled without any active material falling off. Furthermore, a grid base having the same dimensions or a conductor part 7 shown in FIG. 3 is produced by casting using a lead-calcium alloy, and the conductor part 7 is used to form a grid base for a boat pole by the method of the present invention. I produced a victory. The weight of the conductor portion 7 when it was solid was 101/sheet.

Table 1 shows the weight of each of these grid bases compared with the commonly used grid base C for cathode plates of the same size. Figure 7 shows the performance of a lead-acid battery at 160°C and 160A.

Figure 1 From these results, it is concluded that if the lattice substrate obtained by the present invention is used, the lattice substrate made of a lead alloy, which is so lightweight that it loses its ability to retain the active material, is inappropriate for mass production. It can be seen that the lattice substrate made of synthetic resin that has been developed can be manufactured continuously, and the performance is almost the same as that of current batteries.

As mentioned above, the present invention has great industrial value, such as being able to prevent the active material from falling off the substrate.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the manufacturing process showing one embodiment of the present invention, Fig. 2 is a plan view of the main part of a synthetic resin body in the form of a lattice used in the superposition plate, and Figs. 3E and 4 are A plan view of a conductor portion made of a lead alloy showing an embodiment of the present invention, FIG.
Figure 6 is an explanatory diagram showing the position where the conductor is placed in Figure 5. , 7th
The figure shows N using a lattice substrate according to the present invention and a conventional lattice substrate.
It is a curve diagram showing the relationship between battery voltage and discharge duration of a 540Z type battery.・1 is the grid base, 4 is the synthetic resin body, 7 is the conductor part Patent applicant Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A lattice-like structure having acid resistance and oxidation resistance on both sides of an expanded base, a punched self-base, or a conductive body formed by punching or casting, which is stronger than lead or lead alloy. A base for a lead-acid battery cathode plate, characterized by fixing a synthetic resin body. 2. Extended substrates made of ships or lead alloys and continuously formed, punched substrates, punched or cast, etc. (thus, formed conductor parts, etc.) have grid-like acid resistance and oxidation resistance on both sides. A method for producing a base for a lead-acid battery cathode plate, which comprises supplying a resin body and fixing the two by heat welding or the like.